复合材料

Abstract(#br)We present the application of a composite material, consisting of a ferromagnetic neodymium powder and a silicone elastomer, alone to realize a microfluidic network with pressure sensitive passive valves. The mixing ratio of the composite and the degree of magnetization can be utilized to adjust the switching point of each single valve. By combining differently adjusted valves within a microfluidic network it is possible to realize a sort of liquid logic and to control the flow in the network just by changing the inward flow respectively pressure.

Abstract(#br)The polypropylene/polydimethylsiloxane/graphite fluoride (PP/PDMS/GF) composites are prepared with dynamic curing technology by simple blending of polypropylene, graphite fluoride and polydimethylsiloxane, and then their superhydrophobic properties are investigated. The results indicates that the static WCA reaches 148° with a sliding angle 6° for surface sandpapered PP/PDMS/GF\u003cce:hsp sp=\"0.25\"/\u003e=\u003cce:hsp sp=\"0.25\"/\u003e100/20/15 composite, which supplies a much economical and convenient method for preparing superhydrophobic materials.

Abstract(#br)Patterned microstructures represent a potential approach for improving current wound closure strategies. Microstructures can be fabricated by multiple techniques including replica molding of soft polymer-based materials. However, polymeric microstructures often lack the required shear resistance with tissue needed for wound closure. In this work, scalable microstructures made from composites based on polydimethylsiloxane (PDMS) were explored to enhance the shear resistance with wet tissue.

Abstract(#br)Polydimethylsiloxane (PDMS) films were treated with either oxygen (O 2 ), nitrogen (N 2 ) or argon (Ar) plasma between 40\u003cce:hsp sp=\"0.25\"/\u003eW and 120\u003cce:hsp sp=\"0.25\"/\u003eW for 5–15\u003cce:hsp sp=\"0.25\"/\u003emin and their surface properties studied by contact angle measurements, infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Abstract(#br)Ethyl cellulose (EC)/polydimethylsiloxane (PDMS) composite films were prepared at various concentrations of PDMS in the films (0, 5, 10, 15, and 20 wt.%). Morphological and chemical analysis by EDX-SEM and ATR-FTIR showed that EC-rich matrices and PDMS-rich particles were formed, with the two polymers interacting through H\u003cce:glyph name=\"sbnd\"/\u003ebonds. The number and diameter of particles in the composite depended on the PDMS content and allowed a fine tuning of several properties such as opacity, hydrophobicity, water uptake, and water permeability.

Abstract(#br)Polymeric piezo-damping composites with robust piezo-damping performance under high temperature steam conditions are highly desirable. In this study, we demonstrate a novel piezo-damping material, consisting of fluorinated (polyaryletherketone)-(polydimethylsiloxane) block copolymers (F-PAEK-b-PDMS) as matrix, multi-walled carbon nanotubes (CNTs) as conductive filler, and barium titanate (BT) as piezoelectric phase.

Abstract(#br)In this work, micro-nanostructure polydimethylsiloxane/silicon dioxide (PDMS/SiO 2 ) composite coatings were fabricated on the surface of magnesium alloys with two different sizes of SiO 2 nanoparticles by a simple painting method. The effects of the proportion of 40 nm and 50–250 nm SiO 2 on the wettability, wear and corrosion performance of the composite coatings were investigated.

We present a study of radiolucent composite materials for use in medicine, providing suitable mechanical properties and high resistance against sterilization decomposition. The composites are composed of carbon (C), aramid or glass (R-glass) fabrics embedded in polydimethylsiloxane (PDMS), polyetheretherketone (PEEK) or polyphenylene sulfide (PPS) matrix. The effect of multiple steam sterilization processes on degrading the mechanical properties, structural integrity and hydrolytic decomposition of the composites was verified. The radiolucency of the composites was also investigated.

本研究的目的是研制一种由聚二甲基硅氧烷( PDMS )主层和聚四氟乙烯( PTFE )增强体组成的复合材料，用于以后的人体假体涂层。将PDMS：正硅酸乙酯( TEOS )：二月桂酸二正丁基锡( DBTL )组成的主层质量比分别在33：1：0.5、25：1：0.5、10：1：0.5范围内，评价复合材料( PTFE：PDMS )的质量比为1：9、1：1、2：3。得到如下结果：以33∶1∶0.5 ~ 1∶9和0.59 MPa的比例10∶1∶0.5 ~ 2∶3的拉伸强度为0.085 MPa，表明通过降低PDMS的质量和增加PTFE的质量可以提高拉伸强度；另一方面，所得复合材料疏水性强，不溶于乙醇和水，交联率分别为98.74 %和99.66 %，最低渗透率为5.24x10 - 7 ( g Pa-1 s-1 m-2 )。由此推断，与人皮肤性质相似的处理为10∶1∶0.5 ~ 1∶1组合，可获得平均抗拉强度0.66 MPa，平均弹性模量6.56 MPa，与43岁人真皮相似。

Abstract(#br)Versatile composite materials integrating extreme water repellency with a series of characteristics have been seen as potential competitors for innovative applications. In this work, the author designs a three-dimensional superhydrophobic composite material (TSCM) featuring robustness and repairability by utilizing organic polymer components, polydimethylsiloxane (PDMS), and epoxy acrylate (EPA) and inorganic component, silica particle (SiO 2 ).